Dan O'sullivan
Principal Software Engineer at Microsoft
Redmond, Washington, United States
Summary
👤
Senior🎓
Top SchoolDan O'sullivan is a Principal Software Engineer with 17 years of software development experience and a long tenure at Microsoft, where he progressed from SDE and test roles to tech lead and principal across teams in Redmond, Dublin, Brazil, India and the US. He brings full-stack and backend expertise with a strong focus on secure cloud deployments and DevOps—evidenced by contributions to Azure Data Factory around Key Vault integration and secure publish flows. Comfortable leading complex cross‑regional projects, he pairs hands-on coding and CI/CD work with mentoring and architecture responsibilities. Dan has entrepreneurial instincts demonstrated by founding a VR real estate startup while maintaining an enterprise engineering career. He holds a BE in Electronic Engineering and often blends hardware-aware thinking with scalable software design. Colleagues describe him as pragmatic, security-minded, and adept at turning brittle build/deploy scenarios into reliable production workflows.
9 years of coding experience
20 years of employment as a software developer
Bachelor of Engineering - BE Electronic engineering, Bachelor of Engineering - BE Electronic engineering at Munster Technological University
.net, c#, javascript, jquery, xslt, xpath, css, html, linq, sql, regular expressions, asp.net, asp mvc, msbuild, power apps
Github Skills (9)
csharp10
vault10
azure-keyvault10
dotnet-core10
netframework10
devops9
error-handling9
deployment-automation8
powershell6
Programming languages (1)
Github contributions (3)
Azure/Azure-DataFactory
Mar 2017 - Apr 2017
Role in this project:
Backend Developer & DevOps Engineer
Backend Developer & DevOps EngineerContributions:13 commits, 3 PRs, 1 comment in 24 days
Contributions summary:Dan focused on enhancing the ADF secure publish functionality, specifically concerning key vault integration for deployment security. Their contributions involved code modifications for secure publishing, including error handling and certificate management, along with updating the necessary project dependencies. The commits indicate involvement in resolving potential issues related to key vault failures and addressing empty build folder scenarios. They also created an ADF custom activity runner.
daosul/Azure-DataFactory
Mar 2017 - May 2017
Contributions:14 pushes in 2 months
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